Boring-head.



H. CASLER.

BORING HEAD.

APPLICATION FILED FEB. 4, 1909.

981,062. Patented a .10,1911

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BORING HEAD.

urmouxox Hum rm. 4, 1909.

Patented Jan. 10, 1911.

2 SHEETSSHEET 2.

INVEII'TOR UNITED STATES PATENT OFFICE.

HERMAN CASLER, OF CANASIOTA, NEW YORK.

BORING-HEAD.

To all whom it may concern:

Be it known that I, I'IERMAN GASLER, a citizen of the United States, residing at Canastota, in the county of Madison and State of New York, have invented certain new and useful Improvements in Boring Heads, of which the following is a full, clear, and exact description.

This invention relates to boring heads for use in connection with machine tools such as lathes, milling machines, drill presses, etc., and has for its chief object to provide a device of the kind mentioned which shall be simple and compact and capable of ready and accurate adjustment, and which shall also be thoroughly protected against the entrance of dirt, chips, and other foreign matter into the adjusting mechanism with consequent derangement or injury of the same.

To these and other ends the invention rcsides in the novel. features of construction and combinations of elements hereinafter described and more particularly set forth in the appended claims.

The preferred embodiment of the invention is illustrated in the annexed drawings, and referring now thereto,

Figure 1 is a diametrical section of my improved boring head, showing the same mounted on the spindle of a machine tool and carrying a drill chuck. Fig. 2 is a similar section of the boring head, but without the adjusting screw by which the transverse adjustment of the chuck-carrying plate is effected. Fig. 3 is a plan view of the device as seen from the top of Fig. 2, showing the aperture which receives the adjusting screw. Fig. -l is a front view of the device, without the threaded ring which retains the sliding or transversely adjustable chuck-plate in position. Fig. 5 is a detail rear View of the chuck-plate, that is, the plate which carries the chuck or other toolholding device used with the boring head. Fig. (3 illustrates a boring bar such as may be mounted in the chuck-plate to hold a cutter for use in boring out a large hole. Fig. 7 is an end view of the boring bar shown in Fig. 6. Fig. 8 is a. side view of the screw by which the adjustment of the chuck-plate is effected. Fig. 9 is a plan view of the graduated disk associated with the chuckplatc adjusting screw to indicate the adjustment thereof. Figs. 10, 11, and 12 are detail views of certain parts associated with the chuck-plate adjusting screw. Fig. 13

Specification of Letters Patent.

Application filed February 4, 1909.

Patented Jan. 10, 1911.

Serial No. 476,057.

shows side and end views of a cutting tool suitable for truing holes.

The body 1 of the boring head is provided with an open threaded socket 2 for connection with the threaded machine-tool spindle 3 on which the head is to be mounted. In the front of the body is a threaded opening 4 (see Fig. 1) at the bottom of which is an inwardly extending circular chamber 5 to receive a transversely sliding or adjustable plate or annulus 6. This plate has a threaded eccentric opening or socket 7 in which the tool-holding device, for example a suitable drill-chuck 8 or boring bar 9, is mounted. This chuck-plate 6 is smaller in diameter than the chamber 5 but slightly thicker than the depth thereof, and is retained in the chamber by a threaded ring 10 screwed into the opening 4.

T 0 permit transversely sliding but no rotary movement of the cliucleplate in its chamber the plate is provided with keys 11 fixed in slots 12 in the rear face of the plate, said keys being alined parallel with the coincidentdiameters of the plate and the eccentric socket 7. In the bottom of the chuck-plate chamber are two keyways 13 in which the keys 11 slide when the chuckplate is adjusted.

For boring and truing an uncored hole the device is used as follows. The adjustable chuck-plate 6 is positioned (by the ad j usting devices hereinafter described) so that the socket T and the drill chuck, as S, are concentric with the spindle 3, and the hole is bored by means of a suitable drill 14. The drill is then removed and a tool 15 (Fig. 13) provided with a laterally extending cutting point 16 is fixed in the chuck. After the tool 15 is inserted in the chuck the latter is adjusted. by moving the supporting plate or annulus (3. by means of the adjusting devices referred to above, so that, the chuck being now eccentric to the spindle, the cutting tool will revolve in a circular path around the axis of the spindle and take off of the surface of the hole a chip (the thickness of which is determined by the degree of adjustment of the chuckplate) sufficient to make the hole truly straight and cylindrical. For truing up a larger hole, for instance one cored in a casting, a suitable tool-holder. for example the boring bar 9, is substituted for the drillchuck. In this case the cutting tool 17 held in transversely adjusted position by a set making the screw 17, is adjusted in the bar to a position which is approximately correct for necessary cut, and the finer adustment is made by shifting the chuckplate 6 in the manner now to be described.

For the purpose of adjusting the chuckplate 6 transversely in its chamber o the following devices are provided. In the side of the body 1 a radial hole 18 is drilled, parallel with the keyways 13 and extending into the rear face of the chuckplate, as clearly shown in Figs. 1 and 2. This hole or socket is then threaded, after which the chuckplate or annulus is taken out and the threads on that portion of the hole lying in the body 1 are removed; sufficient stock being taken off in the process to eliminate every trace of the threads, thus leaving such portion of the hole larger than originally by an amount i slightly greater than the depth of the l threads. In this hole is an adjusting screw I 19, shown in detail in Fig. 8, the threads of which engage those in that portion of l the hole 18 lying in the chuck-plate 6; and f it will therefore be evident that if the screw I be held against displacement in line with its l axis, rotary movement thereof will cause the chuck-plate to move diametrically back and forth in its chamber 5. The shank 20 of the screw 19 is smaller in diameter than the threaded part of the screw, and is encircled by a two-part threaded ring 21 (shown in detail in Figs. 10 and 11) screwed into a threaded rabbet at the top of hole 18; I said ring being provided with holes 22 by I which it may be engaged by a suitable tool extending through registering holes 23 in the head 24 of the adjusting screw in the operation of assembling the parts. The l two-part ring just described therefore serves I to hold the screw against moving radially of the body 1. The head 2- of the screw I has micrometric graduations 2% around its edge, which, in conjunction with a suitable index mark or a vernier (not shown) on the body of the boring head, afford an accurate l indication of the adjustment of the chuckplate 6 produced by any fractional part of a revolution of the screw; the movement produced by any number of whole revolutions being noted in any convenient way, for example by counting the revolutions as the adjustment is effected.

As previously explained, the threads in the hole 18 in the body 1 are entirely removed. This is for the reason that if any trace of the threads were left they might be engaged by the screw 19 and hence permit slight play of the latter since the grooves with which the threads would engage are necessarily somewhat deeper than the height of the threads. To make the screw fit its socket l8 accurately and so obviate any possibility of lost motion the socket in the body 1 is provided with a curved member 25 J2me.

(shown in detail in Fig. 12) constituting a bushing and fitting closely the threads on the micrometer adjusting screw 19.

In order to make the boring head compact and yet afford a considerable range of movement for the chuck-plate (3, the latter is made as small in diameter as possible. The result is that when the plate is moved (downwardly as viewed in Fig. 1) to its position of maximum eccentricity the threaded portion of the socket 18 in the plate may overlap the spindle socket 2 and so permit dirt, chips, or other foreign matter to enter the socket 18 when the device is not fast on the spindle. Such dirt, chips, etc., may injure the threads in the socket or on the screw, or interfere with the proper working of the parts. To obviate such possibility the edge of the spindle socket adjacent to the chuck-plate is rabbeted to receive a plate or flat ring 26 which serves to close the socket 18 when the part of the lat ter in the chuck plate would otherwise be open to the spindle socket. This ring 26 is preferably removable, when the chuckplate is taken out of its chamber, to permit easy cleaning of the threads in the spindle socket 2.

It is to be understood that the device herein specifically described is merely the preferred embodiment of the invention, which may be embodied in other forms without departure from its proper scope as defined by the appended claims.

What I claim is:

1. In a boring head, in combination, a body having in its rear an axial socket for attachment to the spindle of a machine tool and in its front a chamber opening into the socket, said body being also provided with a lateral socket, an annular chuck-plate mounted in said chamber and adjustable transversely therein, means mounted in said lateral socket and engaging the chuck-plate to adjust the same, and a ring positioned at the forward end of the said axial socketto prevent the entrance of foreign matter into said lateral socket when the chuck-plate is in an eccentric position, as set forth.

2. In a boring head, in combination, abody having in its rear an axial socket for attachment to the spindle of a machine tool and in its front a chamber opening into the socket, said body being also provided with a lateral socket, a chuck-plate carried by the body and adjustable diametrically thereof and provided with a screw threaded part registering with the said lateral socket, an adj usting screw mounted in the lateral socket and engaging said threaded portion of the chuck-plate, and a ring removably positioned at the forward end of the axial socket to prevent the entrance of foreign matter into the lateral socket when the chuck-plate is in an eccentric position, as set forth.

3. In a boring head, in combination, a body adapted to be mounted on the spindle of a machine tool, said body having in its front a chamber and in its side a socket opening into the chamber, a chuck-plate transversely adjustable in the chamber and having a threaded portion registering with said socket, an adjusting screw rotatably mounted in the socket and engaging the threaded portion of the chuck-plate, and a bushing in the socket to maintain the screw in close engagement with said threaded portion without lost motion, as set forth.

4. In a boring head, in combination, a body adapted to be mounted on the spindle of a machine tool and provided with a lateral socket, a chuck-plate carried by the body and adjustable diametrically thereof, a headed screw rotatably mounted in the lateral socket and operatively related to the chuck-plate to adjust the same, said screw being provided with a shank, and a divided ring encircling the said shank and removably secured to the said body to retain the adjusting screw in its socket, as set forth.

5. In a boring head, in combination, a body provided with an axial socket for attaching the body to the spindle of a machine tool and having a lateral socket, a transversely adjustable chuck-plate carried by the body and having a threaded portion registering with said lateral socket, means positioned between the said axial socket and the chuck-plate to prevent the entrance of foreign matter into the lateral socket when the chuck-plate is in an eccentric position, a screw rotatably mounted in said lateral socket and operatively related to the chuckplate to adjust the same, and means positioned in the lateral socket to prevent lost motion of the adjusting screw.

6. In a boring head, in combination, a body adapted to be mounted on the spindle of a machine tool, and provided with a lateral socket, a chuck-plate carried by the body and adjustable transversely thereof, and provided with a threaded part registering with said lateral socket, an adjusting screw mounted in said socket to adjust the chuck-plate, and means in said socket to maintain the screw in close engagement with' the said threaded part of the chuck-plate without lost motion, as set forth.

7. In a boring head, in combination, a body having at its rear an axial socket for attachment to the spindle of a machine tool and at its front a chamber, said body being also provided with a lateral socket, a chuckplate transversely adjustable in said chamber and provided with means engaging the bottom of the chamber for confining the adjusting movement of the chuckplate to a direction parallel to the axis of the said lateral socket, said chuck-plate having also a threaded portion registerin with the lateral socket, removable means for retaining the chuck-plate in the chamber, a screw rotatably mounted in the lateral socket and engaging the threaded portion of the chuck-plate, a bushing in the lateral socket to maintain the screw in close engagement with said threaded portion and prevent lost motion, and means positioned between the said axial socket and the said chamber to prevent the entrance of forcing matter into the lateral socket when the chuck-plate is in an eccen tric position, as set forth.

8. In a boring head, in combination, a body having in its rear a socket for attachment to the spindle of a machine tool and in its front a chamber, a transversely adjustable chuck-plate mounted in the chamber, a toolcarrying member carried by the chuck-plate and extending forwardly out of the chamber, a closure for the front of the chamber, stationary relatively to the chuck-plate but having an aperture through which the tool carrying member extends to permit movement of the latter with the chuck-plate, and means operable from outside the chamber for adjusting the chuck-plate, as set forth.

In testimony whereof I affix my signature in the presence of two subscribing witnesses.

HERMAN CASLER.

-Witnesses:

CHAS. JONES, MARION J. SHAW. 

